## 实验任务1

### 实验代码

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define N 5
#define R1 586
#define R2 701

int main(){
int number;
int i;

srand( time(0) );//以当前系统时间作为随机种子

for(i = 0; i < N; ++i)
{
number = rand() % (R2 - R1 + 1) + R1;
printf("20228330%04d\n", number);
}

return 0;
}



## 实验任务2

### 实验代码

#include <stdio.h>

int main(){
double x, y;
char c1, c2, c3;
int a1, a2, a3;

scanf("%d%d%d", &a1, &a2, &a3);
getchar();
printf("a1 = %d, a2 = %d, a3 = %d\n", a1, a2, a3);

scanf("%c%c%c", &c1, &c2, &c3);
printf("c1 = %c, c2 = %c, c3 = %c\n", c1, c2, c3);

scanf("%lf%lf", &x, &y);
printf("x = %lf, y = %lf\n", x, y);

return 0;
}


## 实验任务3

### 实验代码1

#include <stdio.h>
#include <math.h>

int main(){
double x, ans;

while(scanf("%lf", &x) != EOF){

ans = pow(x, 365);
printf("%.2f的365次方：%.2f\n", x, ans);
printf("\n");
}
return 0;
}


### 实验代码2

#include <stdio.h>
#include <math.h>

int main(){
double x, ans;

while(scanf("%lf", &x) != EOF){

ans = 9.0/5*x + 32;
printf("摄氏度c = %.2f时，华氏度f = %.2f", x, ans);
printf("\n");
}
return 0;
}


## 实验任务4

### 实验代码

#include <stdio.h>

int main(){
char light,r,g,y;
while(scanf("%c", &light) != EOF){
getchar();
if(light == 'r')
printf("stop!\n");
else if(light == 'g')
printf("go go go\n");
else if(light == 'y')
printf("wait a minute\n") ;
else
printf("something must be wrong...\n");
}

return 0;
}


## 实验任务5

### 实验代码

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(){
srand(time(0));

int a = rand()%30 + 1;
int x;
int i=1;
printf("猜猜2023年4月哪一天会是你的lucky day\n\n");
printf("开始喽，你有三次机会，猜吧（1~30):");

while(i++<4){
scanf("%d", &x);
if(x==a){
printf("哇，猜中了:-)");
break;}
else if(x<a)
printf("你猜的日期早了，你的lucky day还没到呢\n\n");
else
printf("你猜的日期晚了，你的lucky day已经过啦\n\n") ;
if(i<3)
printf("再猜（1~30)：");
}
return 0;
}


## 实验任务6

### 实验代码

#include <stdio.h>
int main()
{
int i,j,n;
for(i = 1; i <= 9; i++)
{
for(j = 1; j <= i; j++)
{
n = i * j;
printf("%d×%d = %d  ",i,j,n);
}
printf("\n");
}

return 0;
}


## 实验任务7

### 实验代码

#include <stdio.h>
int main()
{
int n,m;
printf("input n:") ;
scanf("%d",&n);
m = 2 * n - 1;
int i,j,k;
for(i = 0;i < n;i++){
for(j = 0;j < m;j++){
if(j == 0){
for(k = 0;k < i;k++){
printf("         ");
}
printf(" O ");
}else{
printf("       O ");
}
}
printf("\n");
for(j = 0;j < m;j++){
if(j == 0){
for(k = 0;k < i;k++){
printf("         ");
}
printf("<H>");
}else{
printf("      <H>");
}
}
printf("\n");
for(j = 0;j < m;j++){
if(j == 0){
for(k = 0;k < i;k++){
printf("         ");
}
printf("I I");
}else{
printf("      I I");
}
}
printf("\n\n");
m = m - 2;
}
return 0;
}